12221012291 has 2 divisors, whose sum is σ = 12221012292. Its totient is φ = 12221012290.

The previous prime is 12221012281. The next prime is 12221012317. The reversal of 12221012291 is 19221012221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12221012291 - 2⁶ = 12221012227 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221012281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110506145 + 6110506146.

It is an arithmetic number, because the mean of its divisors is an integer number (6110506146).

Almost surely, 2^12221012291 is an apocalyptic number.

12221012291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221012291 is an equidigital number, since it uses as much as digits as its factorization.

12221012291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 12221012291 in words is "twelve billion, two hundred twenty-one million, twelve thousand, two hundred ninety-one".